*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197002308792
1970001045
197100101011
1972001078
1973001078
1974002079
1975000088
19760030912
19770030912
1978001089
197900401115
198000401014
198100301316
198200301417
198300301417
198400301619
198501201518
198601601825
1987031001528
1988111201630
1989021501734
199019701532
19912141801549
19920391701571
1993214016117176
1994279418025839
1995274515023785
1996166121019702
1997018918123231
1998243513121472
19990272411870
2000449122131549
2001229018128339
2002052230017569
2003140625022454
2004157521123621
200505133036120
2006037061126458
2007150055228586
2008091591123184
200914659021127
2010615194020271
20110119153028300
2012315356071283
20134122120016262
201431469405248
201506311442
20160440614
2017010113
Total3971071183239129264